If you want to hide it from the end user who is viewing your site from a browser? If so, there's no way to do it. Your browser *has* to have that sent in clear-text, otherwise it cannot render it.
There are ways you can make it harder to obtain, but in the end, a smart or persistent person can get to the source no matter what you do.
Basically view source should not have any confidential data that was the part of secured website development.